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SIMATIC S7-400, DIGITAL INPUT SM 421, OPTIC. ISOLATED, 16 DI, 120 V AC, WITH 1 COMMON POINT |
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| Supply voltage |
| Load voltage L1 |
| Rated value (AC) |
120 V |
| permissible range, lower limit (AC) |
74 V |
| permissible range, upper limit (AC) |
132 V |
| Input current |
| from backplane bus 5 V DC, max. |
100 mA |
| Power losses |
| Power loss, max. |
20 W |
| Digital inputs |
| Number of digital inputs |
16 |
| Number of simultaneously controllable inputs |
| all mounting positions |
| up to 40 °C, max. |
16 |
| up to 60 °C, max. |
16 |
| Input voltage |
| Rated value, AC |
120 V |
| for signal "0" |
0 to 20 V AC |
| for signal "1" |
74 to 132 V AC |
| Frequency range |
47 bis 63 Hz |
| Input current |
| for signal "0", max. (permissible quiescent current) |
4 mA; 0 to 4 mA |
| for signal "1", typ. |
6 mA; 6 to 20 mA |
| Input delay (for rated value of input voltage) |
| for standard inputs |
| Parameterizable |
Yes |
| at "0" to "1", min. |
2 ms |
| at "0" to "1", max. |
15 ms |
| Cable length |
| Cable length, shielded, max. |
1000 m |
| Cable length unshielded, max. |
600 m |
| Encoder |
| Connectable encoders |
| 2-wire sensor |
Yes |
| Permissible quiescent current (2-wire sensor), max. |
4 mA |
| Galvanic isolation |
| Galvanic isolation digital inputs |
| between the channels, in groups of |
1 |
| between the channels and the backplane bus |
Yes |
| Isolation |
| Isolation checked with |
1500 V AC |
| Dimensions |
| Width |
25 mm |
| Height |
290 mm |
| Depth |
210 mm |
| Weights |
| Weight, approx. |
650 g |
| Status |
Jun 6, 2014 |
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